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Let's Sort Shapes and Objects
Today I will be... Identifying and describing 3-D shapes
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Mental Oral Starter
Which shape in this set do you think is the odd one out?
Explain your answer to a partner.
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Mental Oral Starter
The triangle is the odd one out.
All of the other shapes are quadrilaterals.
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Mental Oral Starter
Which shape in this set do you think is the odd one out?
Explain your answer to a partner.
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Mental Oral Starter
The regular hexagon is the odd one out.
All of the other shapes are irregular hexagons.
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Mental Oral Starter
Which shape in this set do you think is the odd one out?
Explain your answer to a partner.
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Mental Oral Starter
The cuboid is the odd one out. It is a 3-D shape.
All of the other shapes are 2-D.
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How would you describe the difference between these two set of shapes?
Share your ideas with the class.
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2-D shapes 3-D shapes
A 2-D shape has two measurements –
length and width. It is usually called a 'flat' shape.
A 3-D shape has three measurements –
length, width and depth. It is usually called a 'solid' shape.
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How many of these 3-D shapes can you name?
Think, pair, then share your answers.
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Pentagonal prism
ConeHexagonal
prismCylinder
Square-based pyramid
Triangular prism
SphereCuboidCube
How would you describe each of these 3-D shapes? What words would you use?
How many did you name? Do you know any other 3-D shapes?
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vertices
We describe 3-D shapes using the following words:
facesedges
Can you remember which part of a 3-D shape each word refers to?
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Face – the flat surface of a 3-D shape
Edge – a place where two faces meet
Vertex – a point where two or more edges meet
If a shape has more than one vertex, they are called vertices.
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How many faces, edges and vertices does a cube have?
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A cube has six faces, twelve edges and
eight vertices.
Did you get this right?
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How many faces, edges and vertices does a square-based pyramid have?
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A square-based pyramid has five faces, eight
edges and five vertices.
Did you get this right?
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How many faces, edges and vertices does a cone have?
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A cone has two faces, one edge and a vertex.
Did you notice?
One of the faces is curved. The edge is also curved.
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How many faces, edges and vertices does a hexagonal prism have?
...and now for a trickier one...
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A hexagonal prism has eight faces, eighteen
edges and twelve vertices.
Did you get this right?
Well done – this was tricky!
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Cube Cuboid
Both of these 3-D shapes have the same
number of faces, edges and vertices.
How else could you describe them so that
someone could identify each one?
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Cube Cuboid
A cube has six square faces.
This cuboid has four rectangular faces and two square faces.
You can describe the 2-D shapes of the faces:
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Now, think back to what you know about 2-D
shapes – can you remember what a
polygon is?
Think, pair then share your ideas.
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A polygon is a 2-D shape where the sides are all straight lines.
Did you remember this?
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Pentagonal prism
ConeHexagonal
prism Cylinder
Square-based pyramid
Triangular prism
SphereCuboidCube
A polyhedron is a 3-D shape where the faces are all polygons.
Which of these shapes are NOT polyhedrons?
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Polyhedrons Not polyhedrons
Can you explain why these three shapes
are not polyhedrons?
Cone CylinderSpherePentagonal
prism
Hexagonal prism
Square-based pyramid
Triangular prism
Cuboid Cube
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Back NextThink, pair, then share your ideas.
What does this set of 3-D shapes have in common?
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Prisms have the same 2-D shape on each opposite end.
The faces joining these two ends are rectangles.
They are all prisms!
Pentagonal prism
Triangular prism
Hexagonal prism
Octagonal prism
The 2-D shape on the opposite ends
is where the name for each prism comes from!
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Back NextThink, pair, then share your ideas.
What does this set of 3-D shapes have in common?
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They are all pyramids!
Square-based pyramid
Triangular-based pyramid
Pentagonal-based pyramid
Hexagonal-based pyramid
A pyramid has flat, sloping faces that all meet at a single point, or vertex. They are named according to the 2-D shape on their
bottom, or base.
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Now it's time to see what you have
learnt about 3-D shapes!
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Plenary
Agree or Disagree?
This cuboid can also be called a rectangular
prism.
Think, pair then share your ideas.
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Plenary
Agree!A prism has the same 2-D shape on each opposite end. The faces
joining these two ends are rectangles.
A cuboid is a special type of prism with its own name, because all of its faces are
rectangles.